first one
x/3 - 6 = -7
x/3 = -7 + 6
x/3 = -1
x = -1 × 3
x = -3
second one
2( x + 12 ) = 18
2x + 24 = 18
2x = 18 - 24
2x = -6
x = -6 ÷ 2
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